Arc-lamp.



E. J. MURPHY,

ABG'LAMP. AYPLIOATION FILED 00T. 20, 1906.

In' Venier VW Edwin J. muv

E. J. MURPHY.

man LAMP.

` APPLIATIUH FILED 00T.26, 1906. gigpgg Patenza Got. 5, w.

8 SHEETS-SHEET 2. Png. i

citizen 'of the vUnited States,

and has for its object to prove the construction of the same.

' UNITED srarnsjearnivr fossiles.,

nnWrN J. MURPHY,v or GLASGOW, sconnnn AssIGNon fro GENERAL PANY, CORPORATON NEW' YORK;

ARC-LAMP.

Application filed OctoberZG, 1906. Serial No. 340,699.-

lb all whom itmay concern: i

Be it known that I, EDWIN J. MURPHY, a

residing at Glasgow, Scotland, have invented certain newT and useful Improvements in Arc-Lamps, of which the following yis a' specification.

My invention relates .to electric arc lamps simplify and im- To this'end my invention consists in cerparticularly pointed out 'in the For a' full luider-standing of the invention" vand of its various objects and advantages,

reference may -.b e had tothe following detailed description taken in connection with the accompanying drawing wherein# l Figure 1 shows partly 1n side lelevation and partly 1n section a lamp arranged 1n ac- 'fcordance ,with one forni of my invention;

Figs. 2 and 3 are cross-sections taken on -lines 2, 2 and 3, of Fig. l respectively;

Fig. l is a detail; Fig; 5 shows a blank from which the follower for the upper electrode holder is made; Fig. G shows a modified `form of follower; Fig. 7 shows a'partial vertical section of a twin carbon are lamp illuvstrating the second -form of my invention; Fig; 8 is a horizontal sect-ionen the line 8 8 of Fig. 7 looking downward, illustrating the applica-tion of ,the stamped metal fol lower-to the twin carbon arc lamp; Fig. 9 is a horizontal sectionon theline 9 -9 of Fig. 7 looking downward, illustrating the lrelative position of the ring clutch to the enlarged lower portions of the electrode holders during a phase of operation; and Fig. 10 is a detail view'showing theuse of two followers ofthe forni shown in. Fig. G.

Referring to the drawing, 1 indicates the frame of an are lamp comprising a hood or .lamp-top 2, a platform '3, and a backbone-el v connecting thehood and platform members.

The backbone consists of two channel-sliaped pieces of sheet metal 5,which are convene. icntly connected at their opposite ends tothe members 2 and 3 by meansof ears 6 and 7 which are formed by splitting the ends of thev backbone members and bending the split The two backbone mem.:l bers ares@ arranged that the channels face each other, Vwhereby convenient .guides are provided for the followerl 8 for the -upper Specification of Letters Patent.

' through them. v

lower 9 to the electrode. This followeifmay be .madenflf y y mantenerlas, ieee.

piece of sheetfmetal which is first shaped .is indicated in full lines in Fig. 5, and portions of which are then bent at right angles to the main body portion along the dotted lines. The linished follower therefore comprises a body portion 9 having at each end a pair of laterallyprojecting ears 10 and 'a further elongated ear ll, projecting laterally from theni'iddleportion thereof. The ears 10 are the'edges of the channels of the guides. The ear l1`is provided with a perforation 13, which passes a screw terminal. 14 which is secured into the upper end of the electrode-holder 15. flhe followerand electrode-holder are therefore rigidly connected together.. lnsulating washers 16 and 17 may be placed between the follower and the electrode-holder, whereby the upper electrode is insulated from the frame. Then only a single set of electrodes is employed, the upper electrode is preferably arranged to move midway between the channel members, the notches in the follower engage with olne edgeof eachof these members so that .t le ear provided 'with notches 12 which engage with This is the arrangement shown. It will be. seen that by making -two passages through vthe platform the lamp may be adapted .for operation with two sets 'of electrodes, as shown in Figs. 7, 8, 9 `and l0. Fig. 8 clearly shows the relation-of the folguide bars li that constitute the backbone of the lamp and that connect the hood 2 to the platform 3, one being ar ranged on'. each side of the 'vertical axis of the lamp. With this arrangement the same followers may be used, but they are rotated through an angle of 1S()O so that the ear 11 lprojects outwardly from the channel meinbers. In. this way space is provided for two followers on each pair of guides, as clearly shown in Fig. 8. i

Instead of making the followerl or followers of sheet-metal, a porcelain block 18, y such as shown. 1n Figs. 6 and l() may be employed, there being four notches 19A arranged 'in the edgesv ofthe block in such positions thatA they channelv members 'when of electrodes isemployed. When, however, it-is. desired toma-lie use of two pairs of electrodes, two of the followers are used, as,v before (seeFig. 10),V and they are so posif .tioned'that only twoof Athe notches on each ELECTRIC -ooM- A 11 projects into the space between engage with all four edges of thef av single central 'pan' follower engage with the channel. members, thev end at which the other two are located projecting laterally from the plane of the channel. members. The feeding of the upper electrode may be accomplished in any suitable manner, as by means ot a clutch 21 and a series regulating magnet 22, the core of which is connected to the clutch through a rod 23and a'lever 24;. `25-is the usual dash-pot, the movable member of which is secured to the lever` Q4, either directly or through the core 26 ot' a shunt magnet Q7.

Coiiside able diiiiciilty is sometimes eX- 'perienced in trimming lamps, by reason ot the shitting ot the clutch so as to prevent the ready insertion of the electrode through it.

@ne i'eature of iny'invention consists in means for guarding against the shitting ot the clutch when the electrode is removed, thereby making it possible to insert a new electrode without diiliculty. To this 'end the electrode-holder 15 is preferably made iii the zt'orin of a split tube enlarged sonie- W'hat in diameter at its loivcr end as at 28, so that when the holder is permitted to drop to its lowerniost position, the enlarged portion 28 surrounds the ring 29 of the clutch and holds it against displacement, as indicated in Figs. 3 and 9. A further feature of my invention coii 'sist's in a light. and still' casing adapted to cover the mechanism between the vlamp-top and the platform. To this end l form the casiiigof a cylindrical tube 30 made of sheetmetal which is corrugated longitudii'ially,

,and at the ends' et the tube arrange metal will appear from the terina ot the appended4 LlaimS.

What I claim as new and desire to secure by Letters 'latent of the United States, is,- .Ll-An arc lamp :traine consisting of a hood, a platform, and tivo parallel channel hars, the .ends of saidv channel hars being bent 4 laterally to 4:torni ears, and -ineans for securing the ears at one. eiidof said bars to 'the hood and those atA the other end to the 2. ln an arc lamp, the vcombination ot a pair of parallel guide bars cach having' a pair of guide edges, an electrode holder, and a follower having 'tour guide .channels adapted to receive and be guided selectively by the four guide edges.l of the liars or hy one guide 'edge of each bar.

3. In an arc lamp, a pair of vertically arranged ,guide bars, a` follower, an electrode holder secured to the follower, the said :tollowerhaving four guide channels spaced to have a selective sliding lit with said zguide bars so as Vto support the electrode holder either between .the bars or at one side tlieieo'li.

el. In an are lamp, a pair of parallel guide bars each ha ving a, pair oi guide edges, a tol lower having Yfour notches each shaped 'for engagement with one edge ot a bar, and means 'l'or supporting an electrode holder troni said follower, the said notches being so spaced that the position' oi the Vfollower and the guide bars may be reversed so as lo support the electrodo holder between theliars or at one side thereoii.

5. .ln-an are lamp, an electrodo, an electrode holder, a-eluich engaging Said electrode for feeding the saine, and 'means on said holder for engaging said clutelnand holding it against displacement when the electrode is removed.

6. lnan are lamp an electrode, an elecA trode holder, a clutch having a portion arranged to surround the electrode,positioned in said holder, and `meant; on the holder for holding the clutch, against displacement upon removal ot the electrode.

7. ln an arc lamp, an eleetrode,an electrode holder, a clutch arranged to surround the electrode positioned in saidy holder, and a socketr in aid holder for receiving. said clutch upon removal oli theclectrode.

8. In anarc lamp, an electrode,-an electrode holder, a. clutch arranged to receive and aetuate the electrode positioned in said holder, and means lon said holder for maintaining lthe clutch against lateral displace ment when the electrode holder has been moved to a predetcriuined position.

9; ln an arclamp, an electrode, au elecltrode holder, a clutch arranged to surround and feed the electrode positioned in said holder, said holder being provided with a socket arranged to receive the clutch when the electrode holder has been inoved to a predetermined position.

l0. ln an arc lamp, a platform having opening for the passage olf an electrode,

ranged to surround the electrode positioned -in said holder, and means on said holder for engaging said 4clutch and ior maintaining the opening therein iiialiiiement With the said opening iu the vplattform when the electrode is removed.

an electrode, an electrode holder, a clutch arf 

